Liu, Li-xin
Su, Xin
Zhang, Yu-nan
Yin, He-mei
Zhang, Qiang
Feng, Yan-ru
Guo, Ying-xue
Zou, Dong-yu
Liu, Ying-li
Funding for this research was provided by:
Heilongjiang Provincial Health and Family Planning Research Projects (2018492)
Article History
Received: 30 January 2018
Accepted: 30 July 2020
First Online: 24 September 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.